std::ranges::enumerate_view<V>::begin

`constexpr auto begin() requires (!__SimpleView<V>);`	(1)	(since C++23)
`constexpr auto begin() const requires /range-with-movable-references/<const V>;`	(2)	(since C++23)

Returns an iterator to the first element of the enumerate_view.

Let base_ denote the underlying view.

1) Equivalent to return /*iterator*/<false>(ranges::begin(base_), 0);.

2) Equivalent to return /*iterator*/<true>(ranges::begin(base_), 0);.

(none)

Iterator to the first element.

end (C++23)	returns an iterator or a sentinel to the end (public member function)
ranges::begin (C++20)	returns an iterator to the beginning of a range (customization point object)

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